PKI 4290 is a portable broadband receiver that detects known, unknown, illegal, interfering or intercepting transmissions. PKI 4290 is particularly suitable for locating hidden listening devices. This is particularly due to the wide variety of antennas in widespread use, e.g. WHIP antennas for 30MHZ – 6GHz as a general-purpose near-field antenna with frequency bandwidth and physical size suitable for many scenarios. Alternatively, VFL LOOP for 10kHz – 30MHz to find transmitters emitting RF at very low frequencies. Or attached light sensor in the 10GHz – 50MHz range, to detect infrared transmitters. Or locator samples in the 20MHz – 6GHz range, which is used when the RF noise level is very high. It is designed to detect RF signals in the immediate vicinity of the probe. Or for covert detection, which finds application with a disguised antenna in the 750MHz – 6GHz range.

In addition, it can be used for audio transmission in the 300Hz – 20kHz range, with the ability to add a positive and negative bias voltage to activate existing microphones and test low-voltage wiring for unmodulated signals. The Acoustic Leakage Detector in the 300Hz to 20kHz range, allows the user to place the probe against structural objects such as walls or windows to listen for acoustic leakage weaknesses. The directional antenna in the 70MHz – 500MHz range as a flag-shaped antenna provides directional coverage for detecting signals in the lower frequency range. The down-converting antenna in the 500MHz – 12GHz range down-converts signals occurring above the standard threshold of 6GHz so that they are detected.

Note: Prolonged storage at temperatures above 40°C may affect the performance and life of the batteries.